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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.openjdk.bench.java.lang.foreign;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.TearDown;
import org.openjdk.jmh.annotations.Warmup;

import java.lang.foreign.Arena;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

@BenchmarkMode(Mode.AverageTime)
@Warmup(iterations = 5, time = 10, timeUnit = TimeUnit.SECONDS)
@Measurement(iterations = 10, time = 10, timeUnit = TimeUnit.SECONDS)
@State(Scope.Benchmark)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@Fork(value = 1, jvmArgs = { "--enable-native-access=ALL-UNNAMED", "-Djava.library.path=micro/native" })
public class SharedCloseStackWalk {

    @Param({"1", "10", "100"})
    int numOtherThread;

    @Param({"10", "100", "1000"})
    int extraFrames;

    @Param({"false", "true"})
    boolean virtualThreads;

    private CountDownLatch stop;

    @Setup
    public void setup() {
        stop = new CountDownLatch(1);
        for (int i = 0; i < numOtherThread; i++) {
            (virtualThreads
                    ? Thread.ofVirtual()
                    : Thread.ofPlatform()).start(() -> recurse(0));
        }
    }

    @TearDown
    public void teardown() {
        stop.countDown();
    }

    @Benchmark
    public void sharedOpenClose() {
        Arena.ofShared().close();
    }

    private void recurse(int depth) {
        if (depth == extraFrames) {
            try {
                stop.await();
            } catch (InterruptedException e) {
                throw new RuntimeException("Don't interrupt me!", e);
            }
        } else {
            recurse(depth + 1);
        }
    }
}
